Direction on table join for current options selected?

Direction on table join for current options selected?

I've got the dataassist insert and update pages working to mark options via a series of checkboxes. The only piece of the puzzle I'm missing is to get the update page to automatically mark the proper checkboxes based upon options that were selected previously. I believe I need to do a query with a table join, and then set the "Check If" item to the results of that query, but my head keeps spinning trying to develop the query. Can someone provide direction on how the query should be written?

It's been quite some time since I originally developed this page, but I believe I followed a similar tutorial when created and I've combed down through the tutorial you linked and I believe my page is in sync with what has been instructed. Everything works great except for the checkboxes for the options not being checked as they should in the update page. I was thinking I needed another recordset on the update page to pull that existing data, but maybe I'm wrong.

Can you tell me what specific part of the MRT tutorial sets the checked/unchecked status? In the "Step 4: Make the checkbox dynamic" instructions, I see plainly how it writes changes to the DB, but I don't see where it sets the checked/unchecked status on the initial page load.

BTW, here is the specific code pertaining to the repeating checkboxes on the update page in case that helps: